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+/**
+ * A UDP transport implementation of a syslog sender.
+ *
+ * Note that there is an anomaly in this version of the code: we query the remote system
+ * address only once during the connection setup and resue it. If we potentially run for
+ * an extended period of time, the remote address may change, what we do not reflect. For
+ * the current use case, this is acceptable, but if this code is put into more wide-spread
+ * use outside of debugging, a periodic requery should be added.
+ *
+ * @author Rainer Gerhards
+ *
+ * Copyright 2009 Rainer Gerhards and Adiscon GmbH.
+ *
+ * This file is part of rsyslog.
+ *
+ * Rsyslog is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Rsyslog is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Rsyslog. If not, see http://www.gnu.org/licenses/.
+ *
+ * A copy of the GPL can be found in the file "COPYING" in this distribution.
+ */
+package com.rsyslog.lib;
+import java.net.*;
+
+public class UDPSyslogSender extends SyslogSender {
+
+ private final int port = 514; // TODO: take from target!
+ private InetAddress targetAddr;
+
+ /** the socket to communicate over with the remote system. */
+ private DatagramSocket sock;
+
+ /** Constructs Sender, sets target system.
+ * @param target the system to connect to. Syntax of target is depending
+ * on the underlying transport.
+ */
+ public UDPSyslogSender(String target) throws Exception {
+ super(target);
+ }
+
+ /** send a message on the wire.
+ * This needs a complete formatted message, which will be extended by
+ * the transport framing, if necessary.
+ *
+ * @param MSG a validly formatted syslog message as of the RFC (all parts)
+ * @throws Exception (depending on transport)
+ */
+ protected void sendTransport(String MSG) throws Exception {
+ byte msg[] = MSG.getBytes();
+ DatagramPacket pkt = new DatagramPacket(msg, msg.length, targetAddr, port);
+ sock.send(pkt);
+ }
+
+
+ /** connect to the target.
+ * For UDP, this means we create the socket.
+ */
+ public void connect() throws Exception {
+ super.connect();
+ sock = new DatagramSocket();
+
+ // TODO: we should extract the actual hostname & port!
+ targetAddr = InetAddress.getByName(getTarget());
+ }
+
+}